Rising of a wetting liquid in a capillary tube is due to__________________?
(A) Surface tension
(B) Cohesive forces
(C) Adhesive forces
(D) viscosity
The boiling point increases down the zero group element due to_________________?
(A) Ion dipole forces
(B) London forces
(C) Hydrogen bonding
(D) Dipole dipole forces
When water freezes at 0°C its density decreases due to_______________?
(A) Change of bond angles
(B) Cubic structure of ice
(C) Empty space present in the structure of ice
(D) Change of bond length
The conversion of vapours back into their liquid state is called__________________?
(A) crystallization
(B) evaporization
(C) vaporization
(D) condensation
Steam causes more sever burn than the boiling water because it possesses _________________?
(A) Latent heat of fusion
(B) Latent heat of vaporization
(C) Latent heat of sublimation
(D) All of the above
The density of water may be__________________?
(A) Equal to that of ice
(B) Greater than that of ice
(C) Less than that of ice
(D) All are possible
Which one of the following does not show hydrogen bonding?
(A) Water
(B) Ethyl alcohol
(C) Phenol
(D) Diethyl ether
All of the following were theorized by Bohr in his description of the atom except__________________?
(A) Angular momentum of electrons in multiples of h/2?
(B) Electrons revolve in discrete circular orbits
(C) Energy of each electron is directly proportional to n2
(D) Electrons radiate energy continuously in a given orbit.
The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________?
(A) Molar heat of sublimation
(B) Molar heat of fusion
(C) Molar heat of vapourization
(D) Latent heat of that liquid